"We really should eat something before we go out," one half of the reasonable brain said, as we set out on our evening walk. "I know it's early, and by the time we get back it'll be dinner, but we really should eat." We'll call it Less-Conscious Brain, or LCB for short. "We'll be fine," said the other half of the reasonable brain, the one actually in charge. We'll call it Conscious Brain, or CB for short. "Peckish," said the stomach. "But not too hungry?" CB asked. "Not yet," the stomach replied. "Good, off we go then." About 200 meters into running, everybody was complaining. "It's too hot in this sweater!" said the shoulders. "I can't handle the burning!" cried the chest. "Our knee pistons are knocking!" the legs complained. "It's been too long since we ran." "We ran just a month ago," CB groused, but slowed down and we wa...